Re: NEC-LIST:Imperfect Ground

I have in th epast had experience with variable groundwater levels which
affected the take-off angles of HF transmitting antennas.

Best regards,
Duncan Baker.
----- Original Message -----
From: <M742503402_at_cs.com>
To: <renier.dreyer_at_poynting.co.za>; <nec-list_at_gweep.ca>
Sent: Wednesday, November 27, 2002 5:44 PM
Subject: Re: NEC-LIST:Imperfect Ground

> Yee Hui,
>
> Please also keep in mind that the dielectric properties of the ground also
> depend on soil moisture. (Furthermore, even if the ground is dry, the
layer
> of dry ground between the ground surface and the water table, if one is
> present, can act as a waveguide! I have observed this.) In addition,
there
> is a frequency dependence. For your purposes, "average" figures may
suffice,
> or perhaps not.
>
> Dave Stein
> --
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> http://www.gweep.ca/mailman/listinfo.cgi/nec-list
>
>

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